Other regional weather bureaus, including the Hong Kong Observatory, categorised it as a "super typhoon" as it intensified to reach gusts of 227 kilometres per hour.

"It is due to exert influence from noon after its edge reaches the island," an official at the Central Weather Bureau said.

"The whole of the island should heighten vigilance against severe winds and torrential rains." Almost 3,000 people, most of them tourists, were evacuated Sunday from Taiwan's Green Island and Orchid Island – popular with visitors.

Authorities said on Monday they were planning more possible evacuations as they assessed the impact of heavy rains.

Taiwan's aboriginal mountain communities are particularly at risk during typhoons, often hit by flooding and mudslides.

Some are still cleaning up after Typhoon Soudelor left a trail of destruction last month.

"A massive amount of rubble caused by the last typhoon is still seen on slopes and river beds. This may cause further damage," the weather bureau said.

More than 24,000 troops are on standby for disaster relief and evacuations, with 100 shelters set up. Emergency response centres have been established in the north and east.

Dujuan was 270 kilometres off the coast of eastern Hualien County at 7:00 am Monday. (2300 GMT Sunday).

The storm threatens long-weekend plans for many as Taiwan celebrates the Mid-Autumn Festival.

A concert by US rock band Bon Jovi due to take place in Taipei Monday was cancelled.

High speed rail was due to be suspended mid-afternoon.

Ferry services to outlying islands have already been suspended and flights to and from the islands will stop from noon.

Dujuan will pass near the Japanese island of Ishigaki as it approaches Taiwan.